论文标题
由自旋传递扭矩驱动的磁跳的三维动力学
Three-dimensional dynamics of magnetic hopfion driven by spin transfer torque
论文作者
论文摘要
磁跳是具有新型自旋结构的三维（3D）拓扑结构，可以实现外来动力学。在这里，我们研究了带有单位HOPF索引的磁性跳跃的当前驱动的3D动力学。归因于旋转浆果相和跳跃的对称性，相位空间纠缠了多个集体坐标，因此，跳跃表现出丰富的动力学，包括沿电流方向的纵向运动，横向运动垂直于当前方向，旋转运动和扩张。此外，跳跃动力学的特征取决于非绝热旋转转移参数与阻尼参数之间的比率。这种特殊的3D磁跳动力学可以阐明了解不同系统中跳跃的普遍物理，并增强3D Spintronics的繁荣发展。
Magnetic hopfion is three-dimensional (3D) topological soliton with novel spin structure that would enable exotic dynamics. Here we study the current driven 3D dynamics of a magnetic hopfion with unit Hopf index in a frustrated magnet. Attributed to spin Berry phase and symmetry of the hopfion, the phase space entangles multiple collective coordinates, thus the hopfion exhibits rich dynamics including longitudinal motion along the current direction, transverse motion perpendicular to the current direction, rotational motion and dilation. Furthermore, the characteristics of hopfion dynamics is determined by the ratio between the non-adiabatic spin transfer torque parameter and the damping parameter. Such peculiar 3D dynamics of magnetic hopfion could shed light on understanding the universal physics of hopfions in different systems and boost the prosperous development of 3D spintronics.
